After a brief survey of epistemologies of collaborative learning and forms of computersupport for that learning, the study of technology affordances for intersubjective learning isproposed as a thematic agenda for CSCL. A fusion of experimental, ethnomethodological anddesign methodologies is proposed in support of this agenda. A working definition ofintersubjective learning as joint composition of interpretations of a dynamically evolving contextis provided, along with an outline for analysis under this definition.